如何即时调整图片大小(express和S3) [英] How to resize image on fly(express and S3)

问题描述

我正在尝试从url获取图片，然后不保存就立即调整大小

I am tring to get image from url and then to resize on fly without saving

var request = require('request');
    request
            .get('s3url')
            .on('response', function (response) {
                console.log(response) // 200
                console.log(response.headers['content-type']) // 'image/png'
            })
            .pipe(res)

我现在可以使用 request lib返回相同的图片，但是我该如何操作它然后作为响应返回呢?

I can now return same picture with request lib but how can I manipulate it and then return as response?

推荐答案

有几个可以调整大小的npm模块，例如 sharp .您可以通过这种方式使用它(示例取自API文档).

There are several npm modules that do resizing one example is sharp. You can use it in this way (example taken from the API documentation).

var transformer = sharp()
    .resize(300)
    .on('info', function(info) {
        console.log('Image height is ' + info.height);
    });

readableStream.pipe(transformer).pipe(res);

visibleStream 将是原始图片的流.

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